<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <!--      alert提示信息框-->
      <el-alert :closable="false" show-icon
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning">
      </el-alert>
      <!--      选择商品分类区域：-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--          级联选择器-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{ expandTrigger: 'hover' ,value:'cat_id',label:'cat_name',children:'children'}"
            @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!--        Tabs标签页-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button :disabled="isBtnDisable" type="primary" size="mini"
                     @click="addDialogVisible=true">添加参数
          </el-button>
          <!--          动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--            展开行-->
            <el-table-column type="expand">
              <!--              通过作用域插槽接收数据-->
              <template v-slot="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                        :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!--                动态编辑标签-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <!--              使用作用域插槽-->
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">修改
                </el-button>
                <el-button type="warning" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button :disabled="isBtnDisable" type="primary" size="mini"
                     @click="addDialogVisible=true">添加属性
          </el-button>
          <!--          静态属性表格-->
          <el-table :data="onlyTableDate" border stripe>
            <!--            展开行-->
            <el-table-column type="expand">
              <!--              通过作用域插槽接收数据-->
              <template v-slot="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                        :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!--                动态编辑标签-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <!--              使用作用域插槽-->
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">修改
                </el-button>
                <el-button type="warning" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--    添加属性或参数的Dialog对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules"
               ref="addFormRef" label-width="100px">
        <!--        这里的prop属性是验证规则-->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--    修改参数对话框-->
    <el-dialog
      :title="'修改'+this.titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules"
               ref="editFormRef" label-width="100px">
        <!--        这里的prop属性是验证规则-->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    created () {
      this.getCateList()
    },
    data () {
      return {
        //商品分类列表
        cateList: [],
        //级联选择框列表
        selectedCateKeys: [],
        //  被激活的tabs标签页名称
        activeName: 'many',
        //动态参数
        manyTableData: [],
        //静态属性
        onlyTableDate: [],
        addDialogVisible: false,
        //  添加数据的表单对象
        addForm: {
          attr_name: ''
        },
        //修改参数对话框状态
        editDialogVisible: false,
        editForm: {},
        //修改参数表单验证
        editFormRules: {
          attr_name: [
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
        //  添加数据的验证对象
        addFormRules: {
          attr_name: [
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
      }
    },
    methods: {
      async getCateList () {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
        this.cateList = res.data
      },
      //    级联选择框改变触发的方法
      handleChange () {
        this.getParamsData()
      },
      //tabs页签点击事件的处理函数
      handleTabClick () {
        this.getParamsData()
      },
      // 获取参数的列表数据
      async getParamsData () {
        //  选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableDate = []
          return
        }
        //  选中的是三级的,根据所选的分类id，获取对应的参数数据
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: this.activeName } })
        if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
        res.data.forEach(item => {

          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          //  控制文本框的显示与隐藏
          item.inputVisible = false
          //文本框中输入的值
          item.inputValue = ''
        })
        console.log(res.data)

        //如果获取的是动态参数里的数据
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableDate = res.data
        }
      },
      //监听添加对话框的关闭
      addDialogClosed () {
        //  重置表单
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数操作
      addParams () {
        //  首先进行表单的预验证
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 201) return this.$message.error('添加参数失败!')
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      //点击按钮展示修改的对话框
      async showEditDialog (attr_id) {
        //获取数据
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: {
            attr_sel: this.activeName
          }
        })
        if (res.meta.status !== 200) return this.$message.error('获取参数信息失败!')
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //监听添加参数对话框关闭
      editDialogClosed () {
        this.$refs.editFormRef.resetFields()
      },
      //点击确定按钮修改参数信息
      editParams () {
        //首先进行表单的预校验
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            {
              attr_name: this.editForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 200) return this.$message.error('修改失败!')
          this.$message.success('修改参数成功')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //  删除事件处理函数
      async removeParams (attr_id) {
        //弹框提示是否确定删除
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        //  对弹框结果进行判断
        //结果为confirm 为确定操作，cancel 为取消操作
        if (confirmResult !== 'confirm') return this.$message.info('已取消删除！')
        //  调用接口进行删除
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除失败!')
        }
        this.$message.success('删除参数成功!')
        this.getParamsData()
      },
      //文本框失去焦点 或按下了enter键都会触发
      handleInputConfirm (row) {
        //trim() 表示消去空格
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        //  用户输入了真实的内容
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      //点击按钮 展示文本输入框
      showInput (row) {
        row.inputVisible = true
        //自动获取焦点 $nextTick:当页面上的元素被重新渲染后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })

      },
      //删除对应的参数可选项
      handleClose (i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      },
      //将对attr_vals的操作保存到数据库
      async saveAttrVals (row) {
        //  发送网络请求，将这一次操作写入数据库中
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
      }
    },
    //计算属性 如果按钮需要被禁用，则返回true,否则返回false
    computed: {
      isBtnDisable () {
        if (this.selectedCateKeys.length !== 3) return true
        return false
      },
      //  当前选中的三级分类的id
      cateId () {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        //  没有选中三级分类
        return null
      },
      //动态计算标题
      titleText () {
        if (this.activeName === 'many') return '动态参数'
        return '静态属性'
      }

    }

  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
